/Engine/Plugins/Media/BlackmagicMedia/Source/BlackmagicMediaOutput/Public/BlackmagicMediaCapture.h
Callbacks when the buffer was successfully copied on the GPU ram. The callback in called from a critical point. If you intend to process the texture/buffer, do so in another thread. The texture is valid for the duration of the callback.
virtual void OnRHIResourceCaptured_RenderingThread ( const [FCaptureBaseData](API\Plugins\MediaIOCore\UMediaCapture\FCaptureBaseData) & InBaseData, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FMediaCaptureUserData](API\Plugins\MediaIOCore\FMediaCaptureUserData), ESPMode::ThreadSafe > InUserData, FTextureRHIRef InTexture )